FiiO at Audio46

FiiO K7 Balanced Desktop DAC and Amplifier (Open Box)

Product SKU: K7 Black (OB)


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Product Details

↓ Details provided by FiiO

K7 A new baseline for balanced desktop sound

Truly balanced headphone amp | THX AAA 788+ amp technology | Dual AK4493S DACs
Multiple intelligent protection systems | Power supply with numerous independent LDOs
Included 12V/24W low-noise switching power supply | RGB status indicators
3 output modes | Two levels of hardware gain | Numerous outputs and inputs

Truly balanced decoding and amplification

The K7 has a six-stage audio circuit with truly balanced analog and digital sections – which helps to reduce crosstalk and reproduce music to a great extent, allowing you to better enjoy the purity of your music.

Democratized high-quality balanced amplification
Couldn’t sound better

Using the same THX AAA 788+ amplifiers as the K9 Pro, the K7 is capable of outputting 560mW into a 300Ω load at 1% distortion, and 2000mW into a 32Ω load at 1% distortion. This ensures both low and high impedance headphones are powered with aplomb, and most importantly lets you experience musicality that’s sure to tug at your heartstrings.

Dual AK4493SEQ Rich and delicate overall sound

The left and right channels are each equipped with an efficient high-performance AK4493SEQ. With this DAC’s pleasant timbre, its rich and delicate overall sound will let you rediscover your music all over again.

Robust decoding capabilities
Take a trip around the music world

The XMOS XUF208 decoder chip uses dual clock management to handle various music formats with ease, allowing you to easily listen to many audio formats.

RGB indicator lights For a colorful entrance

The RGB indicator lights are capable of displaying single colors as well as mixed colors, with a unique light flow effect during power-on/off or input switching. Dazzling and vivid light effects give your desk some much needed spice.

RGB indicator lights

Multiple intelligent protection systems Worry-free listening

Overheating, overload, DC protection systems ensure that the K7 always operates at its best, so you can always enjoy a wonderful listening experience in multiple scenarios.

Consistent inside and out For pure clean listening

The K7 features a power design consisting of multiple independent stages, with a voltage of each stage being regulated by low-noise LDOs. Feeding this power design is an external 12V switching power supply. All in all, the K7’s power design is designed to supply plentiful, clean power for an extraordinary listening experience.

Numerous exciting possibilities All within reach

Variety of inputs and outputs All in one place

The K7 contains USB, optical, coaxial, and RCA inputs. Outputs are 6.35mm single-ended and 4.4mm balanced for pleasant listening no matter the headphones.

Inputs and Outputs

Input switching With just one click

One key controls switching between the 4 different inputs, with a flowing light effect to indicate when the input has switched and is ready.

3 different outputs With just one touch

One touch of a handy key allows you to switch between 3 output modes (for use with headphones, with speakers, or use as a DAC).

Two gain levels Find a comfortable volume

The high and low hardware gain levels allow you to easily adjust the K7 to handle headphones of various impedances and sensitivities for a rich and consistent listening experience.

Quality construction For an elegant air

The K7 features an all-aluminum alloy construction, carefully finished with CNC and other processes. Its elegant black color is perfectly complemented by the gold accents of THX and Hi-Res Audio badges topped with a splash of color from the RGB lights for a thoroughly luxurious appearance.

Precisely tuned volume For truly moving experience

Thanks to ADC curve reconstruction, experience a smooth 112 steps of adjustable volume free of channel imbalances and noise – ensuring that every note is faithfully reproduced.

Lightweight all-in-one Simple and elegant

The K7 features a petite design that only measures 55mm thick and with a footprint of less than 1/3 of an A4-sized sheet of paper – allowing it to fit perfectly on modern desks.

A jack of all trades Capable under any scenario

  • Connecting to smartphones via USB-B to Type-C cable
  • Connecting to desktop DACs
  • Connecting to desktops or laptops via USB
  • Connecting to smartphones via USB-B to Type-C cable
  • Connecting to desktop DACs
  • Connecting to external amplifiers or active speakers

Abundant Accessories

  • Power cable x1
  • Power adapter x1
  • USB cable x1
  • Quick start guide x1
  • Warranty card x1

Basic Specifications

  • DAC: AK4493SEQ*2
  • Decoder: XMOS XUF 208
  • Amplifier: Dual THX AAA 788+
  • Outputs: 6.35mm/4.4mm
  • Inputs: USB/OPT/COAX/RCA
  • Output power 1: ≥2000mW (32Ω, balanced/THD+N<1%)
  • Output power 2: ≥1220mW (32Ω, single-ended/THD+N<1%)
  • Signal-to-noise ratio: ≥120dB ( A-weighted, UAC)
  • Noise floor: PO<4.4μV (A-weighted, UAC); BAL<7.7μV (A-weighted, UAC)
  • Output impedance: <1Ω (32Ω load)
  • Weight: About 610g
  • Dimensions: About 120mm×168mm×55mm
General specifications
Name / Model No. K7 Hardware solution DAC: AK4493S*2 , USB: XMOS XUF208 , Voume IC:NJU72315 * 2, AMP:THX AAA 788+ * 2
Color Black Volume Scroll Potentiometer+ADC Sampling
Weight ≈610g FiiO Control Unsupported
Gain L/H Firmware upgrade XMOS can be upgraded via USB
Maximum supported sampling rate

PCM 384kHz-32bit/DSD256(USB DAC)

PCM 192kHz-24bit(COAX)

PCM 96KHz-24bit(OPT)

Sampling rate indication Blue:44.1KHz/48KHz
Recommended headphone impedance 16~300Ω
Buttons and interfaces
Buttons input button*1+gain switch*1+output switch*1 USB USB B(data)
LINE IN RCA sockets LINE OUT RCA sockets
BAL PO Standard 4.4mm port SE PO Standard 6.35 mm port
Power parameters
Power supply DC 12V/2A Battery capacity /
Audio parameters
Line output performance parameters
Frequency response 20Hz~20KHz:±<0.4dB(UAC) Crosstalk ≥102dB (1kHz/10kΩ)
20Hz~20kHz:±<0.8dB(SPDIF IN ) Noise floor <3μV(dbA)
20Hz~50KHz:±<2.2dB(UAC) SNR ≥116dB (dbA,UAC)
20Hz~50kHz:±<1.7dB(SPDIF IN )
THD+N <0.0005%(1kHz/10kΩ/dbA) Output level ≥2Vrms
Headphone output performance parameters(6.35mm)
Output power1 L+R≥1220mW+1220mW(32Ω /THD+N<1%) Output impedance <1Ω(32Ω)
Crosstalk ≥77dB (1 kHz/32Ω)
Output power2 L+R≥140mW+140mW(300Ω / THD+N<1%) Noise floor <3.1μV(dbA,AUX IN)
Frequency response 20Hz~20KHz:±<0.3dB(UAC) <4.4μV(dbA,UAC)
20Hz~20kHz:±<0.7dB(SPDIF IN )
20Hz~50KHz:±<2.1dB(UAC) SNR ≥128dB (dbA,AUX IN)
≥120dB (dbA,UAC)
20Hz~50kHz:±<1.6dB(SPDIF IN )
THD+N <0.0003% (1 kHz/32Ω/dbA) Peak output voltage ≥18.9Vpp
Balanced headphone output performance parameters(4.4mm)
Output power2 L+R≥2000mW+2000mW(32Ω /THD+N<1%) Output impedance <1Ω(32Ω)
Crosstalk ≥124dB(1 kHz/32Ω)
Output power3 L+R≥560mW+560mW(300Ω / THD+N<1%) Noise floor <5.1μV(dbA,AUX IN)
Frequency response 20Hz~20KHz:±<0.3dB(UAC) <7.7μV(dbA,UAC)
20Hz~20kHz:±<0.7dB(SPDIF IN )
20Hz~50KHz:±<2.1dB(UAC) SNR ≥128dB (dbA,AUX IN)
≥120dB (dbA,UAC)
20Hz~50kHz:±<1.6dB(SPDIF IN )
THD+N <0.0003% (1 kHz/32Ω/dbA) Peak output voltage ≥37.7Vpp


Model K5Pro ESS K7
Appearance Dimension ≈120x130x55mm ≈120x168x55mm
Weight ≈480g ≈610g
Ports USB port USB-B USB-B
LO ports RCA Line Out、RCA Line in RCA Line Out、RCA Line in
OPT port Standard TOSLINK Standard TOSLINK
COAX port Standard RCA Standard RCA
PO ports 6.35mm 6.35mm, 4.4mm
Output - PO/LO/PRE
Gain H/M/L H/L
Volume knob Volume control and power on/off Volume control and power on/off
Indicator ≤48K:Blue
The light circle shows multiple colors when powering on and switching inputs.
DAC ES9038Q2M*1 AK4493SEQ*2
Volume chips NJW1195AV NJU72315+OP
Parameters Output power
PO ≥1250mW(32Ω,THD+N<1% UAC)


BAL - ≥2000mW(32Ω ,THD+N<1%,UAC)
Noise-floor BAL - <5.1μV(A计权,AUX IN)
SNR(dbA+lowpass) PO ≥118dBrA(UAC) ≥123dBrA(UAC)
LO ≥115dBrA(UAC) ≥120dBrA(UAC)
THD+N PO(UAC) <0.0009%(1 kHz,32Ω,dbA) <0.00028% (1 kHz,32Ω,dbA)
LO(UAC) <0.0012%(1kHz,10kΩ,dbA) <0.0005%(1kHz,10kΩ,dbA)
Crosstalk PO:≥80dB(1 kHz 32Ω USB DAC)
LO:≥98dB (1 kHz 32Ω USB DAC)
PO:≥77dB (1 kHz 32Ω,USB DAC)
BAL:≥124dB(1 kHz 32Ω,USB DAC)

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